vo - lan - tor (vo-lan'ter) n. A vertical takeoff and landing aircraft that is capable of flying in a quick, nimble, and agile manner. --intr. & tr.v. -tored, -toring, tors. To go or carry by volantor. [Lat. volare, to fly. Fr. volant, to move in a nimble and agile manner ]

The Skycar is capable of vertical take-off and landing (VTOL) similar to a helicopter and flies from point of departure to destination much like an airplane. However, the Skycar has been designed to also travel at low speed for short distances on the ground like an automobile. It has fold-up wings which make it narrow enough to be useable on roadways. All this and, incredibly, it's easy to fly!

Actually we believe that most of "flying" will be done by the on-board systems. The aircraft is controlled by the pilot providing inputs for direction, speed and altitude through the simple controls and the on-board systems interpret these inputs to do the is called a "fly by wire" system. Therefore operating a Skycar, while very easy, could be done by someone with little training or flight experience, but will, at least initially, require a private pilot's license until the ease of operation and safety are thoroughly demonstrated. The Moller Skycar is a volantor capable of these remarkable capabilities through the use of latest proprietary technologies developed by Moller International.

Favorable power to weight ratio is the basic qualification for VTOL. However, in order to create a safe, environmentally responsible and economically feasible method of transportation Moller International had to take into consideration a number of components including airframe and engines.

There is a real opportunity to create a unique airplane centered on the use of nacelles similar to those produced for the Skycar 400.The low by-pass ratio of the small turbo-fans, for example the PW 600 series, leads to high fuel consumption relative to the thrust produced.Two rotary engine driven nacelles on the sides of a four or six-place clean airplane would provide airspeeds in excess of 300 miles per hour in an aircraft with jet–like appearance as shown in the rendering to the right.We ran some numbers on a comparison between a Pratt-Whitney PW610F and a Skycar 400 nacelle.

400 Nacelle

PW 610F

Trust (max. static)

900 lbs (300 hp)

950 lbs


52 inches

42 inches


30 inches (24 inch dia fan)

14 inches


250 lbs to 275 lbs

~300 lbs

By-pass Ratio



SFC (static)

.15 lbs per hp-hr

.6 lbs per hp-hr

The amount of static thrust produced for a given horsepower is roughly a function of the (by-pass ratio) 1/3 .Of course there are offsets at speed.The nacelle will have more drag and to avoid variable pitch and reduce internal aerodynamic drag the exit area on the nacelle would need to be reduced at higher speeds.However the direct and indirect costs should be substantially less as well as noise.We have run our engines on diesel fuel but prior to fully developing a “compound” version of the rotary engine (two rotors working in series versus parallel) the limited compression ratio will provide inferior fuel consumption and the need for an ignition source.We have run compound versions of our engine but in a far from optimized form.

Alternative to High-Speed Helicopters.pdf


Skycar Flight Control System Architecture Overview.pdf


Engine Technology

Ducted Fan Configuration

Aerial Applications
The Rotapower engine is compact and nearly vibration free, allowing it to be used within the hub of an aircraft’s ducted fans. The image above shows how a ducted-fan conventional aircraft might be configured.  With approximately 1/5th fuel usage of turbine-powered aircraft for similar performance, our RotaFan offers an attractive alternative to the light business-class aircraft manufacturer.

Nacelle Technology



Ducted Fan Nacelles

The lift / thrust for our volantors comes from nacelles containing our Rotapower rotary engines and moving vanes. Stability for VTOL is obtained by adjusting thrust produced by the fans. Transition occurs by both rotation of the duct and repositioning of the vanes. High speed efficiency is maintained by reducing the duct exit area, thereby avoiding the need for variable pitch fan blades.